Add Nix package for PyQGIS API Documentation builder

Author: imincik

README.md

@@ -25,7 +25,7 @@ You can either:
 
 * export the PYTHONPATH yourself
 * export your QGIS build directory with ``export QGIS_BUILD_DIR=~/dev/QGIS/build``
-* or provide QGIS build directory as argument to the script: ``./build-docs.sh -qgis-build-dir ~/dev/QGIS/build``
+* or provide QGIS build directory as argument to the script: ``./scripts/build-docs.sh -qgis-build-dir ~/dev/QGIS/build``
 
 ### Testing & development
 

flake.lock

@@ -0,0 +1,148 @@
+{
+  description = "PyQGIS API Documentation";
+
+  nixConfig = {
+    #   extra-substituters = [ "https://example.cachix.org" ];
+    #   extra-trusted-public-keys = [ "example.cachix.org-1:xxxx=" ];
+
+    # IFD is required for QGIS repo.
+    allow-import-from-derivation = true;
+  };
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+    # TODO: https://github.com/qgis/QGIS-Sysadmin-Documentation/issues/129
+    qgisMaster = {
+      url = "github:imincik/QGIS/nix-package-master";
+    };
+
+    # TODO: https://github.com/qgis/QGIS-Sysadmin-Documentation/issues/129
+    qgisLatest = {
+      url = "github:imincik/QGIS/nix-package-release-3_42";
+    };
+
+    # TODO: https://github.com/qgis/QGIS-Sysadmin-Documentation/issues/129
+    qgisLtr = {
+      url = "github:imincik/QGIS/nix-package-release-3_40";
+    };
+  };
+
+  outputs = inputs@{ self, nixpkgs, qgisMaster, qgisLatest, qgisLtr }:
+
+    let
+      # Flake system
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+      nixpkgsFor = forAllSystems (system: import nixpkgs {
+        inherit system;
+        config.allowUnfree = true;
+      });
+
+    in
+    {
+      #
+      ### PACKAGES
+      #
+
+      packages = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+
+        in
+        {
+          docs-master = pkgs.callPackage ./package.nix {
+            qgis = inputs.qgisMaster.packages.${system}.qgis;
+            qgisRepo = qgisMaster;
+            qgisIsMasterVersion = true;
+          };
+
+          docs-latest = pkgs.callPackage ./package.nix {
+            qgis = inputs.qgisLatest.packages.${system}.qgis;
+            qgisRepo = qgisLatest;
+          };
+
+          docs-ltr = pkgs.callPackage ./package.nix {
+            qgis = inputs.qgisLtr.packages.${system}.qgis;
+            qgisRepo = qgisLtr;
+          };
+        });
+
+
+      #
+      ### APPS
+      #
+
+      apps = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+          inherit (nixpkgs) lib;
+
+          wwwLauncherMaster = pkgs.writeShellApplication {
+            name = "website";
+            runtimeInputs = [ pkgs.python3 ];
+            text = ''
+              exec ${lib.getExe pkgs.python3} \
+                -m http.server 8000 \
+                -d ${self.packages.${system}.docs-master}/
+            '';
+          };
+
+          wwwLauncherLatest = pkgs.writeShellApplication {
+            name = "website";
+            runtimeInputs = [ pkgs.python3 ];
+            text = ''
+              exec ${lib.getExe pkgs.python3} \
+                -m http.server 8000 \
+                -d ${self.packages.${system}.docs-latest}/
+            '';
+          };
+
+          wwwLauncherLtr = pkgs.writeShellApplication {
+            name = "website";
+            runtimeInputs = [ pkgs.python3 ];
+            text = ''
+              exec ${lib.getExe pkgs.python3} \
+                -m http.server 8000 \
+                -d ${self.packages.${system}.docs-ltr}/
+            '';
+          };
+
+        in
+        rec {
+          website-master = {
+            type = "app";
+            program = "${wwwLauncherMaster}/bin/website";
+          };
+
+          website-latest = {
+            type = "app";
+            program = "${wwwLauncherLatest}/bin/website";
+          };
+
+          website-ltr = {
+            type = "app";
+            program = "${wwwLauncherLtr}/bin/website";
+          };
+
+          default = website-master;
+        });
+
+
+      #
+      ### SHELLS
+      #
+
+      devShells = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+
+        in
+        {
+          # Development environment
+          default = pkgs.mkShell {
+            buildInputs = [ ];
+          };
+        });
+    };
+}